Telegraph-key.



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A. H. ADAMS & J. N. WALLACE. TELEGRAPH KEY.

, 1912. RENEWED $313.18

Patented June 16, 1914.

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UNITED OFFICE.

ARTHUR ADAMS, 0F SPARKILL, NEW YORK. AND JOHN N. WALLACE, OF ANTWERP, BELGIUM, ASSIGNORS T0 WESTERN ELECTRIC COMPANY, 0]? NE! YORK, N. Y., A

CORPORATION OF ILLINOIS.

TELEGRAPH-KEY.

To all whom it may comet-n Be it known that we. ARTHUR H. ADAMS.

. Specificationof Letters Patent.

a citizen of the United; btates.v residing at Spar-kill, in the county of ltockland and E State of New York. and Jonx KALLALE. a subject of the King of (treat Britain. residing at Antwerp. Belgium. have invented a certain new and useful Improvement in 'lclegraph-Kcys. of which the following is a full. clear, concise. and exact description.

This invention relates to a telegraph key, and particularly to a key for use in printing telegraph systems.

The object. of this invention is to provide an improved key for actuating current controlling contacts which will be simple of construction and reliable and efficient in operation.

In the drawings Figure l is a side elevation showing the normal position of the key in full lines and its operatt-rd position in dotted lines: Figs. 3 and 4e are SQCtlOIlfil detail views showing various positions of the inner end of the key and its related contacts.

The contact lever 10 is pivoted intermediate its ends to any convenient support and carries at its outer end the finger button 1] having its inner end formed into a substantially U-shaped portion as shown in order to provide two operative portions. The movement of the key in an upward and downward direction is limited by the stops 12 and 13, respectively. A spring 14. fastened at one end to the key lever and at the other end to the supporting member, tends to keep the key lever in its upward or normal position. Also mounted on the support and in operative relation to the forked end of the key lever is an insulating block 15 car rying the contact plates 16 and 17. The upper ends of the contact plates are extended as at 18, each extension having a depression 19. Mounted on the support is a pivoted insulating block 20 having a cutaway portion which rests normally between the depressions 19, keeping-the contact plates out of engagement. with each other. A spring 22 is attached to the pivoted insulating block 90, which spring is strong enough to move the insulating block 20 upward when the same is freed from the contact plates 16 and 17. A pin 23 limits the upward movement of the insulating block 20. An upper extension 24 of the forked Patented Jun 0 16, 1914.

700.697. Renewed February 18, 1913. Serial No. 749.277.

end of the lever contacts with the pivoted insulating block 20 forcing the same betweenthe depressions '19 of contact plates to and li'gthereby keeping them separated. .\n insulating member 25 't'astened'to the lower extension of the forked portion operates on its upward movement to force the insulating block 20 from between the contact plates 10 and 1.7.

The operation of the. device is as follows: The normal condition of the insulating block 20 and the insulating member 25 is shown in Fig. On the depression of the key lever 10 its inner end, carrying the insulating member 25 is moved upwardly, forcing the insulating block 20 from between the contact plates 16 and 17. the position after this movementbeing shown in Fig. 3. The tension of the spring 22 keeps the insulating block 20 upward in contact with the stop pin 23. ()n the release of the key lever it is returned to its normal position by the spring 14, the insulating member 25 moving from between the contact plates 16 and 17, and allowingthe contact plates to move into engagement with each other as shown in Fig. l. The duration of the contact is determined by the length of time necessary for the key lever to return toits normal position. or until the part '24 of the forked end of the key lever moves into engagement with the insulating block 20 forcing the same between the contact plates 16 and 17 thereby separating them. It will be seen that the key is of such character that contact is made only after the key has reached the full limit of its stroke, and that the contact is made only during the'upward movement of the key.

What we claim is: r

1. t telegraph key comprising a reciprocating key lever having two operative portions, contact members, a movable block normally resting between said contact members and operable by each of the portions of said key lever to be removed from between and projected between said contact members, and a spring for returning said key lever to normal position to force said block between said contact members.

In a telegraph key in cdmbination, contact members, an insulating block normally key lever having two operative portions, one

portion for moving said block between said members and one portion for moving said block from between said members.

3. In a telegraph key the combination of contact members, an insulating member situated therebetween and normally separating the same, of a reciprocating lever carrying at one end an insulating member adapted to move into contact with the insulating member between the contacts, means to return the key lever to its normal position whereby the circuit is closed by the contact members, and means operating on the return of the key lever to normal to force the first named insulating member into its normal position.

4. In a telegraph key the combination of a support, a pivoted lever mounted on said 5 support and carrying at one end an insulat- 2U ing member, a pair of contact members lo- ARTHUR H. ADAMS. JOHN N. WALLACE. Witnesses:

F. R. MOBERTY, F. T. WOODWARD. 

